| Castel Gandolfo to Belvedere Marittimo | 223.66 mi (359.94 km) |
| Castel Gandolfo to Benevento | 118.25 mi (190.31 km) |
| Castel Gandolfo to Bergamo | 310.72 mi (500.06 km) |
| Castel Gandolfo to Bernalda | 229.16 mi (368.80 km) |
| Castel Gandolfo to Bertinoro | 168.10 mi (270.52 km) |
| Castel Gandolfo to Besana in Brianza | 320.70 mi (516.12 km) |
| Castel Gandolfo to Besozzo | 346.12 mi (557.02 km) |
| Castel Gandolfo to Biancavilla | 306.55 mi (493.34 km) |
| Castel Gandolfo to Biassono | 317.28 mi (510.61 km) |
| Castel Gandolfo to Bibbiano | 229.78 mi (369.80 km) |
| Castel Gandolfo to Bibbiena | 141.45 mi (227.64 km) |
| Castel Gandolfo to Biella | 349.43 mi (562.36 km) |
| Castel Gandolfo to Bisceglie | 202.42 mi (325.76 km) |
| Castel Gandolfo to Bisignano | 244.91 mi (394.15 km) |
| Castel Gandolfo to Bitetto | 218.05 mi (350.92 km) |
